在这些物种中，受精卵发育为雌性，未受精卵发育为雄性。
In these species, fertilized eggs develop into females and unfertilized eggs into males.
雄性站在那里保护这个卵，用双脚保持它的平衡，并用被称为育儿袋的有羽毛的皮肤覆盖着它。
Males stand and protect the egg by balancing them on their feet and covering them with feathered skin known as a brood pouch.
若它们都是雄性，就要一只单个的雌性来和他们配对，并要雌性将卵存放在它们的巢穴中。
If they are males, a solitary female may mate with them and deposit her eggs in their nest.
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